Anisotropic magnetodielectric coupling in antiferromagnet Co4Nb2O9

2019 
The magnetodielectric effect has been investigated for single crystals of a honeycomb antiferromagnet Co4Nb2O9. In addition to large magnetoelectric coupling, a magnetodielectric response was observed in the antiferromagnetic phase, which is anisotropic with respect to the direction of the external magnetic field within the basal plane. To explain the anisotropy, we examined the magnetoelastic effect and found that the honeycomb is elongated along the magnetic field direction but shrunk along the perpendicular axis. The distortion should cause the change in the force constant, leading to a variation of permittivity in the presence of a magnetic field.
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